You will have to use the Samsung Kies program on a PC or Windows laptop with smartphone connected to it to upgrade as you have the international version of this device. This requires a different file than the one T Mobile pushes. I use ODIN instead but that is a bit more advanced to explain and can be dangerous if done wrong. The Samsung Kies method is safe as once the program recognizes your device, it will tell you there is an update and offer to download and install it.
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